Repairs to the railroad tracks have forced the closing of a section of Lower Main Street in Saco until 8 p.m. Thursday, according to police.

Police said the street is blocked off just south of the intersection of Main and Water streets in Saco. Biddeford police also have closed a section of the street on the other side of the river, police said.

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Police are urging motorists to avoid the area.

The repairs to the tracks led to the cancellation of four Downeaster trains on Thursday.

Train service between Boston and Portland has been affected over the last several weeks because of repairs to the railroad track, which officials said was damaged by the severe winter weather.